201001321 has 2 divisors, whose sum is σ = 201001322. Its totient is φ = 201001320.

The previous prime is 201001313. The next prime is 201001327. The reversal of 201001321 is 123100102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152893225 + 48108096 = 12365^2 + 6936^2 .

It is a cyclic number.

It is not a de Polignac number, because 201001321 - 2³ = 201001313 is a prime.

It is a super-3 number, since 3×201001321³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 201001298 and 201001307.

It is not a weakly prime, because it can be changed into another prime (201001327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100500660 + 100500661.

It is an arithmetic number, because the mean of its divisors is an integer number (100500661).

Almost surely, 2^201001321 is an apocalyptic number.

It is an amenable number.

201001321 is a deficient number, since it is larger than the sum of its proper divisors (1).

201001321 is an equidigital number, since it uses as much as digits as its factorization.

201001321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 201001321 is about 14177.4934667592. The cubic root of 201001321 is about 585.7778835307. Note that the first 3 decimals are identical.

Adding to 201001321 its reverse (123100102), we get a palindrome (324101423).

The spelling of 201001321 in words is "two hundred one million, one thousand, three hundred twenty-one".